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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bd4c6a2059bd8e6d6c2e82b3817a9270e685299a3344c155bbb8045e893e242' 
  AND token = 'nmL2FnOtyxvNL37W0sC94kLhYwqHc/vIG5/6q9lf8iM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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