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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51e2ee736c1ff19aeea2546421a3f05e47acda857fc33171b752340e26b20567' 
  AND token = 'p9VjV2wgoBz+W9/PFZcaIw0+4dAEUpxj7P0Bt4nbses=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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