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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c46bd6d5ef31cc32c2cc610b97944f091ffbffa6712b258a9e95a481cbcf999' 
  AND token = '7mzn6ZIuJFzdp1pygXH8F5oXmBQvWDmZ+UHooo83Lec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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