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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eebaaafa4ece2e4bf59a6ceab1a717e0e050c1329be395617bafee5740fe5abc' 
  AND token = 'DxY2A7wRwQZ7VN1ZYvQhza5CAyvtReaY8DcDrPldMYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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