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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfddfadeaa3b4084a8327c3f0c1ea699e0e6e1fc8e4a5eebfb878ed08f19ad1b' 
  AND token = '0dSylIWaWy/BldrD7aHxT4wosgAR1ztZaojzDPkwHN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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