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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cceb641df2f0645453b2801377b10b7a8338fe7cf53339bcf70d46ea346e4e38' 
  AND token = 'p9tmjE0jotMWjk//kktFwDK2/aA+9a2Jocr7aiac/cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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