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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0969a873f4abdb5261a254cda9a1816a5aa515ac55c988b8a10f302b46f3d18c' 
  AND token = 'R97MY8Agw+NKPwVWZPkV7V9M9khxJci1ZgT16I/G390=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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