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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec9084d68ab10448714c5f63ab52dc61f85342964fa0d3c1f81f4bacb70fbf35' 
  AND token = 'IPCfetadlivMOhGoopjAac9t5mqXtEeL5fuPoF2Sscw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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