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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a50bd8a02da747a6d47445a8a57e858c3f55548b2488d460a3ba46b91c9d0e7' 
  AND token = '+37PZHxuiXhdSH2QaaEpI6qGGxA7ldYAMZkV8kziJ04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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