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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ea2a00804d54c8c433c2aa6e0edbce0971418a246999ed97f63c14454d555bc' 
  AND token = 'AIVKDaVnDLFc/xWU8fKdv4QD1ostuxG0xt0T7MfYYhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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