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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ca31fedd48cebc622c12f5a9d079e46e86cd47dc76c274c440eb3b07da1a3a0' 
  AND token = '7A+LCuExCW2YcdOn7v2Y1xsI7hDTgiCKWw432510iYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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