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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75cbd92fffeef8d7c103f71b2bd4d6e7fd6e7929f48d9cb054aa90d0f07e8204' 
  AND token = 'kRhSB5qg8b9K+G5EMzdhj3nyJ2fHCKeDhvQa5PzFni0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}