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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd5c5fa0909c726bb3b5e16f3d873a959db8995760270508566370799472060' 
  AND token = 'KKMD/Sc5sbRbrV8BlDJ6iukA5DQJ7iJ+BLTU3cMn1do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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