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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37a19063ece20687c47c1144945eccbbfada580bcdce711d6160f469f147fcac' 
  AND token = '4+8K/Vd96NC2OtqbxRyt6UVl/MCu72aXcH0kWnD1/0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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