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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa5b62fc73a8001fa062fe8254381c1f6505b7e1e6021d7ad048a8bcc8afca3b' 
  AND token = 'bWpB0V9Cp5E76FOeBnLVznUgd7mlFd1h1/xOsQwgnrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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