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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95ad27a783abdf80b509cf7afe02030fc1cb00af3460e9c06eaeea64d1d16e7f' 
  AND token = 'Vf0EwtA+DMONgxeb4GuhnFKc0UX/CF97gBCsLS64X0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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