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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86875e8840c5d6c02d521e91bb7b1f3b6529fefbdb23f686cb36a30d8a93f54d' 
  AND token = 'Nz14vKRhCyAhR3L2Uu/ybHMuStAw/6cqrw3M8p+oTMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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