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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcd57d644eebda1371bd3386107b2893c1cecb10d4cf081e6500d0ced08f4abc' 
  AND token = 'sHV1VqM9ArD2CGBMgKUW76kr2jKArI8+iTEKr1eRK2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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