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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '194cb2c0aeda3cb8546eaab1f3acb874af18bb6629b600e9c90a562fff33ee62' 
  AND token = '2pZ/cPFKVcE2O7B0x4UQ/oMOpccKWswYR7PuqZ3WzMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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