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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e7aeb88e0adbc50516be1a5d62befbfa99e6b4030cd8ffb5ac003b7b673aec2' 
  AND token = 'LXbwBWDxR3ys1ZzuFG7G5CY1oBozfeWLkZcY/uygPr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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