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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb77f095cfdff1eef029593be4968c1c57b72e5f7da905ec199c772a0b7ce4f1' 
  AND token = '+8ZfycYDg2RMwfeUI8z2M4Ao5FC0QRR2OVAisTLkQnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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