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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e7c17441595a6157f224643418c4ed0c650a71525c65cabb74228e17d5ffeb3' 
  AND token = 'g8fbkyCzGyc6azY2Z2cxyqOIBQzf/MrSXEYWMSwkkyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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