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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62dbae3b256109bfb5a2ffbc09655d3e60b9db122eae70785d44bada1fa7cb9d' 
  AND token = 'OX9rksDnACo5NlnbRpG0i7OhOM3biZpTiPpCABf84ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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