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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9059f89adc43a035c6e987856e0c39c50baa7a3e151259eb153e70ab700168d3' 
  AND token = '6yPELIQOMhpxH4SQbceFJm8CnqvnJKUdKQAUdIsJRHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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