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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ec9a23de9468517257c693d4c6b8c02fb6758cbe5990101b91d435fcc3e390e' 
  AND token = '+MoIKLeVkw/OTEMD5kVC85dENYu/fNgK29oacbTh7Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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