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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a58d65e3092f629ce6795e31aaa7d2cc40ced8f10931445e6d5d96c55d7e5f' 
  AND token = 'Spa0j8d+7G1/jkcwz1E+ZCXM08Zd9Rm5cYQdoxYRvWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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