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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a9bf8c04f3ae7d1bbc2c1c9cdb1170889e6f6430cea8b292be7a664b4a73e9a' 
  AND token = 'Es/ad0Dv3vDopy6LzoKjDhZiqvEDvWBwcgtHQ0mzUXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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