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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1358978469bde98dba6f38ebe67537549cff1793907031f622cb16963eee0d6f' 
  AND token = 'mAfWJJdcJfmHyo7DcJA4aoNGGdot/EL+zMpyaL2XYpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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