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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1390ac675bd08d099089e54472508cf1234f2932182e2b965e8a4a78d877597' 
  AND token = '9exrC6Es641rDHwTzJ5cehlPTLjm7s/AgXEx7NCcUtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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