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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb0c88950c15ab5684b656c930450eebbb9ac64cc072a4d7f05b86e84d1fdecd' 
  AND token = 'ukPOhXJcs/U/0XIZMTvbywf7mgwuw04WHpycnZYOogk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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