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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a01656de156f92949d3567d8c2aefa665ec13997b0914f91b0ce969dfe99aeea' 
  AND token = 'qKzhv2Ho6vVSCWDXLCgv7jKr1CcDIOCcEQkJ1pwTE4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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