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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc2ee6b0894361e660726d4110d789e4cbd192ba5ce85ae8b1597029fcc9c41' 
  AND token = 'ckhdAr3yue8OtW6Id+Hb7QFG1a1kQP5ULc7TX/RDVfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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