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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2a24828de029841fc0d6cf5c822dcf2def1d4a77c7989bbfb6fc605debb4cff' 
  AND token = 'N0p3AbLGasSKEqUZTSm0gHP7GeOkplrXis5U3U6+EVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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