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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50b4959b8995a949a1c12e29239f18788e637229918fe2b110d2c3f5cdf45173' 
  AND token = 'tdfkwE0x8ehbOyMFHfbMP2WGeV1MOdqihKEcQIkD5U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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