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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58ea8e92f8f3b09b72972718e846e90c02a44044b1576476ba20892fe430f295' 
  AND token = 'TLjnrGpT4bd4SZZnVLtHLsEOgw0uvgbIWaRYCInXZXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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