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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bea1dfcf04e2720d9c676677bf3152ad6aa7d2231da234259a8cd9cf8174dbd' 
  AND token = 'M5VxNGT0EuFhiJS1s2ctEf2j2kX7cpVEeRpxuMwWrtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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