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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4fac08b3f62e1215aefc90cac68df8c36997c52f8e05ae43ad09f3f3a152078' 
  AND token = '9U9dGMGRN5WNmId8R22aUizLJ+ZXs88BVjnR8+/P9DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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