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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ab2d7e0ffe855a51ffa4936f199179bb925a6ff2df505eeae6064587d0635bb' 
  AND token = 'NGVAVC0WN0U+eES0arwg145Z2TYEwWFoXS7q5eZeWsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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