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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17fbc25305a63ca9574b10e77dc0c9c327b611b4778d0f195242daa4929c040d' 
  AND token = 'HwJ0UfG4ZE/PVtPqTUmEwzIaJ3zPPSqyZ5bIUO2g/eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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