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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e27f0b11ec8eb6ae3df4ce5dcc3df7abcd1e327f309811d1ef51b3d35a599e5d' 
  AND token = 'qTwVOO6GH/bk7akOxDJJczKzDxZWya7konfNEZ4Pyp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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