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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '138808a24ed33b6fc461eafae849a7a6ad0e9a2a8b11782ece9e012cd57500a9' 
  AND token = 'Bq29A6xwnOuUAxDocG9Fk0IFWfbb4pr2Q6SUrAmOa10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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