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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86db8017a335a94a62a331642bc0a9b52a78a6d618f830f03434c906d7f662b3' 
  AND token = '3A2T+JOuTmCovufFOkyL+ckmTQJrp+z8+8ZSqvDwJC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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