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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78a2a31f37b9014a2e941a397470681113e539fbe7750794b3353a7072847e4d' 
  AND token = '8Q/MIerDwecKAZ+8wTbBmYX+4JWZBLOIxFGcwpxbOrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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