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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f77f82177497a6fe5dd0677f10efc565a63d8ab5561af691dea7eeaa26d5a7e' 
  AND token = 'HAjzEi0qEld9JhuDR0CAJBGnSdHu6S1X3j90pBEiD9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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