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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c3327c2e7dd326a1ee3495394bf94f586451875846ad16d48dbe5ff585d6ce3' 
  AND token = 'FUpjri2s4Zr9UWn+JqbXknlq7JyASis+bXgrQi2F3x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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