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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdab5c2141d1b68067d30ea3f0ae5099086f19d92ce2d5037a3212150766f263' 
  AND token = 'ZWml6D6ShLCYVeY8cuzQg1BWv/9aO9BHUYlh88eeQMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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