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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e89f08b9a61b627b3ad1a5c7371c1a1ec6c695815dcc76d8527ceeae60fe8d4' 
  AND token = 'WkF3M4pz7yx7WD+Y0Ito53cWCz3cHzbrUYRT/fVZmRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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