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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4eb937b475155c3347b7abd1856461494608371e9a24bf5be33cc358f9d25d3' 
  AND token = 'GAq4l4/x1eutrqd6xcORaLBmasLLymVoxbeVt7OAQHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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