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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db36d201d13c8f3cd0b08cecba34821df7bc78dc5f1974a5fd259400d8555c9b' 
  AND token = '0MrQh8Sx3kAUZ0G2R54IZpoJdZTQy096VvD2rK4jaKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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